118 lines
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118 lines
8.0 KiB
HTML
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Application development" />
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<meta name="abstract" content="Programmers can write high-level language programs that use SQL statements for iSeries distributed application programs." />
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<meta name="DC.subject" content="writing Distributed Relational Database applications, applications, writing Distributed Relational Database, SQL package, definition" />
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<title>Application development</title>
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<body id="rbal1program"><a name="rbal1program"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Application development</h1>
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<div><p>Programmers can write high-level language programs that use SQL
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statements for <span class="keyword">iSeries™</span> distributed
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application programs.</p>
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<p>The main differences from programs written for local processing only are
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the ability to connect to remote databases and to create SQL packages. The
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CONNECT SQL statement can be used to explicitly connect an application requester
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to an application server, or the name of the relational database can be specified
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when the program is created to allow an implicit connection to occur. Also,
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the SET CONNECTION, RELEASE, and DISCONNECT statements can be used to manage
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connections for applications that use distributed unit of work.</p>
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<p>An <dfn class="term">SQL package</dfn> is an <span class="keyword">iSeries</span> object
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used only for distributed relational databases. It can be created as a result
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of the precompile process of SQL or can be created from a compiled program
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object. An SQL package resides on the application server. It contains SQL
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statements, host variable attributes, and access plans which the application
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server uses to process an application requester's request.</p>
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<p>Because application programs can connect to many different servers, programmers
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might need to pay more attention to data conversion between servers. The <span class="keyword">iSeries server</span> provides for conversion of
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various types of data, including coded character set identifier (CCSID) support
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for the management of character information.</p>
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<p>You can create and maintain programs for a distributed relational database
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on the <span class="keyword">iSeries server</span> using the SQL
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language the same way you use it for local-processing applications. You can
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embed static and dynamic Structured Query Language (SQL) statements with any
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one or more of the following high-level languages: </p>
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<ul><li><span class="keyword">iSeries</span> PL/I</li>
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<li>ILE C/400<sup>®</sup></li>
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<li>COBOL/400<sup>®</sup></li>
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<li>ILE COBOL/400</li>
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<li>FORTRAN/400</li>
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<li>RPG/400<sup>®</sup></li>
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<li>ILE RPG/400</li>
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</ul>
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<p>The process of developing distributed applications is similar to that of
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developing SQL applications for local processing. The difference is that the
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application for distributed processing must specify the name of the relational
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database to which it connects. This might be done when you precompile the
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program or within the application.</p>
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<p>The same SQL objects are used for both local and distributed applications,
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except that one object, the SQL package, is used exclusively for distributed
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relational database support. You create the program using the Create SQL program
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(CRTSQL<em>xxx</em>) command. The <em>xxx</em> in this command refers to the host
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language CI, CBL, CBLI, FTN, PLI, RPG, or RPGI. The SQL package might be a
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product of the precompile in this process. The <span class="cmdname">Create Structured
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Query Language Package (CRTSQLPKG)</span> command creates SQL packages
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for existing distributed SQL programs.</p>
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<p>You must have the <span class="keyword">DB2<sup>®</sup> UDB Query Manager and SQL Development Kit</span> licensed
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program installed to precompile programs with SQL statements. However, you
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can create SQL packages from existing distributed SQL programs with only the
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compiled program installed on your server. The <span class="keyword">DB2 UDB Query Manager and SQL Development Kit</span> licensed
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program also allows you to use Interactive SQL to access a distributed relational
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database. This is helpful when you are debugging programs because it allows
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you to test SQL statements without having to precompile and compile a program.</p>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rbal1progdrd.htm">Programming considerations for a distributed relational database application</a></strong><br />
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Programming considerations for a distributed relational database
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application on an <span class="keyword">iSeries server</span> fall
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into two main categories: those that deal with a function that
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is supported on the local server and those that are a result of having to
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connect to other servers. </li>
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<li class="ulchildlink"><strong><a href="rbal1pdrdp.htm">Prepare distributed relational database programs</a></strong><br />
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When you write a program using SQL, you can embed the SQL statements in a host program.</li>
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<li class="ulchildlink"><strong><a href="rbal1wrkpkg.htm">Work with SQL packages</a></strong><br />
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An <dfn class="term">SQL package</dfn> is an SQL object used
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specifically by distributed relational database applications. It contains
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control structures for each SQL statement that accesses data on an application
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server (AS).</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rbal1kickoff.htm" title="Distributed database programming describes the distributed relational database management portion of the i5/OS licensed program. Distributed relational database management provides applications with access to data that is external to the applications and typically located across a network of computers.">Distributed database programming</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../cl/crtsqlpkg.htm">Create Structured Query Language Package (CRTSQLPKG) command</a></div>
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<div><a href="../sqlp/rbafykickoff.htm">SQL programming</a></div>
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</div>
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</div>
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</body>
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